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Predictions of the dynamic response of piled foundations in a multi-layered half-space due to inertial and railway induced loadings

Predictions of the dynamic response of piled foundations in a multi-layered half-space due to inertial and railway induced loadings
Predictions of the dynamic response of piled foundations in a multi-layered half-space due to inertial and railway induced loadings
In this paper, the dynamic pile-soil-pile interaction (PSPI) in a multi-layered half-space is investigated for the prediction of the response of piled foundations due to railway vibrations. Two methods of modelling piled foundations in a multi-layered half-space are presented. The first is an efficient semi-analytical model that calculates the Green’s functions of the multi-layered half-space soil using the thin layer and the dynamic stiffness matrix methods. The second is a fully-coupled model that utilises the boundary element (BE) method to simulate the soil, where the Green’s functions are calculated using the ElastoDynamics Toolbox (EDT). The paper aims to investigate the accuracy and the efficiency of the semi-analytical model by comparing the predictions of the two methods. A set of comparisons is performed, including the driving point response of a single pile and the interaction between two piles. The comparisons reveal that, at most frequencies, the semi-analytical model can predict the driving point response and the dynamic interaction with acceptable accuracy and computational efficiency. The model is then used for predicting the response of a pile-group due to the vibration field generated by a railway in varying distance from the piles. The vibration field generated by the railway is modelled as the superposition of the response due to harmonic loadings generated at the wheel-rail interface and the vibration response is examined at different points on the free surface away from the piles. The comparisons highlight the efficiency and accuracy of the semi-analytical model and illustrate its practical application.
Ntotsios, Evangelos
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Hamad, Waleed
64e8b19b-9a4f-4df8-810d-0c98864ced47
Thompson, D.J.
bca37fd3-d692-4779-b663-5916b01edae5
Hussein, M.F.M.
3535c131-1710-4edc-a4a1-8fe67dee3f67
Hunt, Hugh
1bc35072-298e-4176-a922-151f4a71f5e4
Talbot, James
43203727-3b3a-4362-9385-f6dff4796def
Ntotsios, Evangelos
877c3350-0497-4471-aa97-c101df72e05e
Hamad, Waleed
64e8b19b-9a4f-4df8-810d-0c98864ced47
Thompson, D.J.
bca37fd3-d692-4779-b663-5916b01edae5
Hussein, M.F.M.
3535c131-1710-4edc-a4a1-8fe67dee3f67
Hunt, Hugh
1bc35072-298e-4176-a922-151f4a71f5e4
Talbot, James
43203727-3b3a-4362-9385-f6dff4796def

Ntotsios, Evangelos, Hamad, Waleed, Thompson, D.J., Hussein, M.F.M., Hunt, Hugh and Talbot, James (2015) Predictions of the dynamic response of piled foundations in a multi-layered half-space due to inertial and railway induced loadings. 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN), Herakleion, Greece. 24 - 26 May 2015. 13 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

In this paper, the dynamic pile-soil-pile interaction (PSPI) in a multi-layered half-space is investigated for the prediction of the response of piled foundations due to railway vibrations. Two methods of modelling piled foundations in a multi-layered half-space are presented. The first is an efficient semi-analytical model that calculates the Green’s functions of the multi-layered half-space soil using the thin layer and the dynamic stiffness matrix methods. The second is a fully-coupled model that utilises the boundary element (BE) method to simulate the soil, where the Green’s functions are calculated using the ElastoDynamics Toolbox (EDT). The paper aims to investigate the accuracy and the efficiency of the semi-analytical model by comparing the predictions of the two methods. A set of comparisons is performed, including the driving point response of a single pile and the interaction between two piles. The comparisons reveal that, at most frequencies, the semi-analytical model can predict the driving point response and the dynamic interaction with acceptable accuracy and computational efficiency. The model is then used for predicting the response of a pile-group due to the vibration field generated by a railway in varying distance from the piles. The vibration field generated by the railway is modelled as the superposition of the response due to harmonic loadings generated at the wheel-rail interface and the vibration response is examined at different points on the free surface away from the piles. The comparisons highlight the efficiency and accuracy of the semi-analytical model and illustrate its practical application.

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More information

Published date: 25 May 2015
Venue - Dates: 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN), Herakleion, Greece, 2015-05-24 - 2015-05-26
Organisations: Dynamics Group

Identifiers

Local EPrints ID: 378758
URI: http://eprints.soton.ac.uk/id/eprint/378758
PURE UUID: 5e463dfe-55e9-4f3b-8a73-92908eef277a
ORCID for Evangelos Ntotsios: ORCID iD orcid.org/0000-0001-7382-0948
ORCID for D.J. Thompson: ORCID iD orcid.org/0000-0002-7964-5906

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Date deposited: 17 Jul 2015 08:06
Last modified: 18 Feb 2021 17:22

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Contributors

Author: Waleed Hamad
Author: D.J. Thompson ORCID iD
Author: M.F.M. Hussein
Author: Hugh Hunt
Author: James Talbot

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